Datuk Ir. Ts. Shamsul bin Ahmad is the President/Chief Executive Officer of Tenaga Nasional Berhad (TNB), entrusted with steering the company through its next phase of transformation while strengthening its mandate as Malaysia’s national energy champion. With over 37 years of service in TNB, he brings extensive experience across generation, fuel management, regulatory affairs and corporate leadership. Prior to his appointment as President/CEO on 1 March 2026, he served as Chief Regulatory and Stakeholder Management Officer, where he played a key role in shaping the industry’s regulatory framework and strengthening stakeholder confidence. He previously led TNB Fuel Sdn. Bhd. as Managing Director and served for a decade as Managing Director of TNB Janamanjung Sdn. Bhd., driving operational excellence and asset reliability. He began his career at various generation power plants, grounding his leadership in strong engineering fundamentals. He holds a Bachelor of Science in Mechanical Engineering from North Carolina A&T State University, USA, and a Master of Business Administration from Universiti Tenaga Nasional.
Dato' Ir. Muhamad Nazri brings over 32 years of leadership experience across strategy, sustainability, generation and network, with a strong track record in delivering business results while advancing TNB's international footprint. He has led complex transformations across diverse geographies, including the Middle East and South Asia, demonstrating a proven ability to navigate cross-border regulatory, commercial and operational environments. His leadership has consistently translated strategy into tangible outcomes, restoring financial performance, strengthening asset portfolios and embedding disciplined execution across domestic and overseas operations. He previously served as Managing Director of TNB Power Generation (TNB GenCo) and TNB Repair and Maintenance (REMACO), and led key international initiatives that expanded TNB's global presence. These include securing major long-term MRO contracts in Kuwait, completing projects and overseeing operations of one of Malaysia’s early IPP ventures in Saudi Arabia, as well as driving turnaround and performance improvements in Pakistan and Cambodia. In parallel, Dato' Ir. Muhamad Nazri has established strategic partnerships with global players to unlock growth in hydrogen, ammonia and biomass co-firing and advanced energy solutions, positioning TNB for resilient and competitive growth amid the energy transition.
Ir. Mahathir brings over 25 years of technical and leadership experience across Distribution, Network reliability, Retail and subsidiary operations, underpinned by strong engineering expertise and disciplined operational execution. His career reflects a consistent ability to translate deep technical capability into enterprise-wide impact aligned with TNB’s network modernisation, system reliability and commercial value creation. Grounded in engineering acumen, sound financial judgement and effective stakeholder engagement, he previously served as Chief Distribution Network Officer and currently holds key governance roles, including Chairman of TNB Engineering Corporation Sdn. Bhd. and directorships with Integrax Berhad and TNB Retail Sdn. Bhd. He has delivered sustained improvements in reliability, efficiency and safety, achieving performance benchmarks comparable to developed markets such as the UK and Europe, while advancing digitalisation and network modernisation initiatives, including a more flexible and interconnected grid. In parallel, Ir. Mahathir has demonstrated strong financial stewardship of the Distribution Network business, encompassing tariff and non-tariff revenue streams, prudent capital management and long-term value preservation. Collectively, these achievements position him to lead Grid and Distribution Network integration supporting TNB’s long-term reliability, resilience and value creation.
Hasmarizal bin Hassan is the Chief Grid Officer (CGO) with over 27 years of experience in Engineering & Design, Operation & Maintenance, and Asset Development for the GRID Division. He ensures the long-term sustainable growth and profitability of the division through effective resource management and optimisation. Hasmarizal plays a pivotal role in guiding TNB in realising the ASEAN Power GRID and driving the Energy Transition agenda. He also plays a vital role in ensuring TNB provides timely and reliable supply to Data Centres. He holds a Master of Business Administration (MBA) from University Tenaga Nasional/Melbourne Business School and a Master of Engineering (M.Eng) from Imperial College of Science, Technology & Medicine, University of London.
Ir. Ahmad Sazree bin Abd Aziz is the Chief Distribution Network Officer, leading Malaysia’s nationwide electricity distribution network to deliver reliable, resilient and customer-centric supply. He has over two decades of experience in distribution operations, asset management and business transformation within TNB, supported by strong technical expertise and enterprise leadership. Previously, he served as Head of Operations, Distribution Network, where he strengthened system reliability, improved SAIDI and CAIDI performance, and optimised operating expenditure. He also held leadership roles including Managing Director of Tenaga Switchgear Sdn. Bhd., General Manager of Distribution in Sabah Electricity Sdn. Bhd., and various regional and maintenance positions, supporting TNB’s Net Zero 2050 aspiration.
Leo Pui Yong is the Chief Sustainability Officer at Tenaga Nasional Berhad (TNB) since 1st June 2023. Her role involves leading TNB's sustainability initiatives and ensuring they align with corporate goals to enhance resilience and long-term success. With over two decades of experience, she formerly served as Chief Risk Officer and held various engineering, auditing, and managerial positions. She graduated with a Bachelor's degree in Electrical & Electronic Engineering from Universiti Tenaga Nasional (UNITEN) and a Master's in Energy & Power Systems from the University of Malaya. Additionally, she is a Certified Internal Auditor (CIA) and holds the RIMS Certified Risk Management Professional certification.
Ir. Dr. Mohd Fadzil Mohd Siam has played a pivotal role in shaping and delivering TNB's corporate strategy and investment agenda, with experience spanning corporate strategy, sustainability, ventures and innovation. As Head of Corporate Strategy & Investment, he led key transformation frameworks including Reimagining TNB 2.0, the Energy Transition roadmap, RT2.0 delivery and the TNB Sustainability Pathway 2050, while overseeing group-wide investment reviews, capital allocation and portfolio prioritisation to ensure long-term value creation. As Chief Strategy & Ventures Officer, he drives holistic strategy execution, embedding ESG and energy transition across growth areas such as green energy, electric mobility, smart grid technologies and innovation-led ventures, strengthening TNB's competitiveness and resilience overall.
TNB Power Generation Sdn. Bhd.
Dato' Shahrir Abdul Latiff is the Managing Director of TNB Power Generation Sdn. Bhd., leading Malaysia’s largest power generation portfolio with a focus on reliability, portfolio diversification and energy transition. He has 37 years of experience in Tenaga Nasional Berhad, with leadership expertise across generation strategy, large-scale project development, asset management, operations and governance. Previously, he served as Chief Development Officer of TNB Genco, driving long-term generation growth strategy and strengthening the development pipeline. He has led the end-to-end development of major generation projects supporting Malaysia’s electricity supply, system stability and energy security. He holds a Bachelor of Engineering from Brighton University and an MBA from the University of South Australia.
Prior to joining TNB, Zarihi was the Senior Director, Investment and a member of the Investment Committee at Ekuiti Nasional Berhad. His responsibilities extend across various investment lifecycles from deal origination, structuring, valuation, due diligence, operational value creation and investment exit. He was also the Vice President, Strategic Investment at Permodalan Nasional Berhad. His role was to maximise total shareholder return from key portfolio companies. He also served as the Vice President at Axiata Digital and Axiata Group. During his early career, he held various roles in management and I.T consulting with Accenture and A.T. Kearney. He was also an engineer at Motorola Semiconductor.
Kamal Arifin is the Chief Retail Officer at TNB, leading its transformation into a future-focused retail business. With over 33 years of experience, he focuses on driving innovative retail ventures and enhancing customer experiences through digital transformation. Previously, Kamal served as Head of Centralised Operations and Centre of Excellence in the Retail Division, and has held leadership roles as State General Manager for Negeri Sembilan and Head of Customer Services for Johor. He holds an MBA from Ohio University, Athens, and a Bachelor’s degree in Electrical Engineering from the University of Texas at El Paso. Kamal is also a member of CIRED Malaysia and serves as the Chairman of HAPUA's Forum on Customer Service 2025.
Badrulhisyam Fauzi is the Chief Financial Officer, overseeing the Group Finance Division to drive financial sustainability and operational excellence for TNB. With over 20 years of experience, he has led financial transformations, strategic planning and governance across diverse industries. He previously served as Group CFO at MMC Corporation Berhad and Covering Chief Executive Officer of Alam Flora Sdn. Bhd. He also held key investment roles at Permodalan Nasional Berhad earlier in his career. Badrul is a fellow of the Chartered Institute of Management Accountants (CIMA), a Chartered Financial Analyst (CFA) charterholder and a member of the Malaysian Institute of Accountants (MIA). He holds a Bachelor of Engineering in Computing from Imperial College London.
Feldatun brings over 27 years of comprehensive experience in human resources (HR) and operations to her role as Chief People Officer. Prior to her appointment, she held pivotal portfolios including Head of Operations, TNB Global Business Solutions (TGBS) and Senior General Manager of People Strategy & Organization Effectiveness, Group HR. Her expertise in HR extends across multiple domains, including HR Strategy, Organizational Development, Workforce Planning, Talent Acquisition, Development & Deployment, HR Management & Operation, and Change Management. Her noteworthy achievements include leading TNB’s transformative initiatives including Value Unlocking Program and spearheading the establishment of TNB Integrated Shared Service Centre (now TGBS).
Azlan Ahmad leads the company’s nationwide IT strategy and operations, spanning throughout the IT value chain, which include IT infrastructure, application, telecommunication network and cybersecurity. He is responsible for deploying holistic, secure and sustainable technology solutions across TNB, as well as driving the corporate digitalisation agenda. He holds a BSc. in Computation (Hons) from the University of Manchester Institute of Science & Technology (UMIST), United Kingdom, and Master of Business Administration (MBA) from the International Islamic University Malaysia (IIUM), Malaysia. Azlan Ahmad is also the Board of Directors for TNB-IT Sdn. Bhd. and Allo Technology Sdn. Bhd., both wholly owned subsidiaries of TNB.
Amir Mahmod Abdullah is the Chief Procurement Officer. As part of his job scope, he defines and manages the long-term group-wide procurement strategy, defines the group-wide cost reduction initiatives, role and scope of central procurement, and defines implementation of best practices. He also oversees the overall skill building and knowledge transfer program. Besides all these, he oversees relationships and negotiations with strategic suppliers and the Bumiputra vendor development program. Lastly, in terms of policies and compliance, he deals with group-wide procurement policies and monitors procurement policies and auditing of compliance.
Datuk Ir. Azmi is the Chief Global Business Solutions Officer, overseeing shared services in Service Delivery, Security, Property, Health Care, Fleet, and Corporate Affairs ensuring quality and cost-efficiency for TNB and its subsidiaries. Over 27 years at TNB, he has strengthened Grid Operations, integrated advanced technologies and enhanced service reliability. Previously, he served as State Stakeholder Affairs Officer, focusing on strategic partnerships. He envisions TNB Global Business Solutions (TGBS) as a globally recognized leader in shared services, driving value for TNB Group, its subsidiaries and external stakeholders. He is also on the boards of Tenaga Cable Industries, TNB LSS Bukit Selambau Solar and TNB LSS Sepang Solar.
Mohamed Azrin brings over 30 years of experience in digital & technology innovation and green energy solutions, with a strong track record in driving sustainable business growth while strengthening organisational resilience in an increasingly complex energy landscape. He has led major transformation initiatives that enhanced ESG outcomes and long-term competitiveness. He previously held senior roles including Head of Digital & Customer Transformation and Head of Sustainability Solutions, alongside board directorships with key TNB’s subsidiaries. As Chief Risk Officer, he ensures integrated governance, regulatory compliance, risk management and business continuity across TNB through robust oversight, risk monitoring and crisis preparedness, while strengthening long-term resilience by proactively managing strategic and climate-related risks.
Ali Munawar bin Haji Salim, ACIS (CS) (CGP) has more than 28 years of expertise in corporate secretarial matters, compliance, and governance at Tenaga Nasional Berhad (TNB). He previously held the position of Senior Manager (Corporate Compliance) in Company Secretary's Office of TNB. He serves as Joint Company Secretary for TNB Power Generation Sdn. Bhd., Southern Power Generation Sdn. Bhd., Jimah East Power Sdn. Bhd., and other companies within the TNB Group.